81083369 has 2 divisors, whose sum is σ = 81083370. Its totient is φ = 81083368.

The previous prime is 81083357. The next prime is 81083371. The reversal of 81083369 is 96338018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78234025 + 2849344 = 8845^2 + 1688^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81083369 is a prime.

It is a super-2 number, since 2×81083369² = 13149025456780322, which contains 22 as substring.

Together with 81083371, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_4729088 and since 81083369 and 4729088 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (81083329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40541684 + 40541685.

It is an arithmetic number, because the mean of its divisors is an integer number (40541685).

Almost surely, 2^81083369 is an apocalyptic number.

It is an amenable number.

81083369 is a deficient number, since it is larger than the sum of its proper divisors (1).

81083369 is an equidigital number, since it uses as much as digits as its factorization.

81083369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 81083369 is about 9004.6304199562. The cubic root of 81083369 is about 432.8232632850.

The spelling of 81083369 in words is "eighty-one million, eighty-three thousand, three hundred sixty-nine".